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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3910246433d94bc5a1463c670dc5a692e8fc388b58e45c7785f7bc1bf7a2ed' 
  AND token = '0ZVFg6b/g8LupqgwaPH1ZoiydW/TebulaAckK6QkUTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}